Question: A reflection grating spectrometer is used to view the spectrum of light from a helium discharge tube. The three brightest spectral lines seen are red,

A reflection grating spectrometer is used to view the spectrum of light from a helium discharge tube. The three brightest spectral lines seen are red, yellow, and blue in color. These lines appear at the positions labeled A, B, and C in the figure, though not necessarily in that order of color. In this spectrometer, the distance between the grating and slit is 30.0 cm and the slit spacing in the grating is 1870 nm.
(a) Which is the red line? Which is the yellow line? Which is the blue line?
(b) Calculate the wavelength (in nanometers) of spectral line C.
(c) What is the highest order of spectral line C that it is possible to see using this grating?

Central CB A maximum A B C 1510 5 5 10 15 Distance (cm)

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